I have compared both on a number of occasions, and lent my Off-Ramp to owners of an Audiophellio to do just that.
The Off-Ramp is clearly and obviously better. The only issue was the price difference - is it worth the extra dosh? For me - yes - but others had a different view on the price vs performance equation.
And indeed a very well regulated supply lifts the Off-ramp up another notch - either Steves Dynamo or I had a local tech build me one. Don't know if it's as good as Steve's effort, but it was less hassle.
Thanks
Bill